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anthro

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Computation of the WHO Child Growth Standards

// repository documentation

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# Anthro

The `anthro` package allows you to perform comprehensive analysis of
anthropometric survey data based on the
[method](https://www.who.int/toolkits/child-growth-standards/standards)
developed by the Department of Nutrition for Health and Development at
the World Health Organization.

The package is modeled after the original [R
macros](https://www.who.int/toolkits/child-growth-standards/software)
provided by WHO. In addition to z-scores, the package adds more accurate
calculations of confidence intervals and standard errors around the
prevalence estimates, taking into account complex sample designs,
whenever is the case by using the [survey
package](https://cran.r-project.org/package=survey).

## Installation

``` r
install.packages("anthro")
```

``` r
remotes::install_github("worldhealthorganization/anthro")
```

## Examples

``` r
library(anthro)
```

### Z-Score

This function calculates z-scores for the eight anthropometric
indicators, weight-for- age, length/height-for-age,
weight-for-length/height, body mass index (BMI)-for-age, head
circumference-for-age, arm circumference-for-age, triceps
skinfold-for-age and subscapular skinfold-for-age based on the [WHO
Child Growth
Standards](https://www.who.int/tools/child-growth-standards).

``` r
anthro_zscores(
  sex = c(1, 2, 1, 1),
  age = c(1001, 1000, 1010, 1000),
  weight = c(18, 15, 10, 15),
  lenhei = c(120, 80, 100, 100)
)
#>   clenhei cmeasure c9mo_flag    cbmi csex  zlen flen  zwei fwei  zwfl fwfl
#> 1     120     <NA>         0 12.5000    1  7.31    1  2.20    0 -2.39    0
#> 2      80     <NA>         0 23.4375    2 -3.50    0  0.95    0  4.13    0
#> 3     100     <NA>         0 10.0000    1  1.62    0 -2.76    0 -5.19    1
#> 4     100     <NA>         0 15.0000    1  1.70    0  0.69    0 -0.29    0
#>    zbmi fbmi zhc fhc zac fac zts fts zss fss
#> 1 -3.01    0  NA  NA  NA  NA  NA  NA  NA  NA
#> 2  4.66    0  NA  NA  NA  NA  NA  NA  NA  NA
#> 3 -5.61    1  NA  NA  NA  NA  NA  NA  NA  NA
#> 4 -0.58    0  NA  NA  NA  NA  NA  NA  NA  NA
```

The returned value is a `data.frame` that can further be processed or
saved as a `.csv` file as in the original function.

You can also use the function with a given dataset with `with`

``` r
your_data_set <- read.csv("my_survey.csv")
with(
  your_data_set,
  anthro_zscores(
    sex = sex, age = age_in_days,
    weight = weight, lenhei = lenhei
  )
)
```

To look at all parameters, type `?anthro_zscores`.

### Prevalence estimates

The prevalence estimates are similar to `anthro_zscores`: again they
take vectors instead of a data frame and column names for the
aforementioned reasons.

``` r
anthro_prevalence(
  sex = c(1, 2, 2, 1),
  age = c(1001, 1000, 1010, 1000),
  weight = c(18, 15, 10, 15),
  lenhei = c(100, 80, 100, 100)
)[, 1:5]
#>                         Group HAZ_pop HAZ_unwpop HA_3_r  HA_3_se
#> 1                         All       4          4     25 25.00000
#> 2         Age group: 00-05 mo       0          0     NA       NA
#> 3         Age group: 06-11 mo       0          0     NA       NA
#> 4         Age group: 12-23 mo       0          0     NA       NA
#> 5         Age group: 24-35 mo       4          4     25 25.00000
#> 6         Age group: 36-47 mo       0          0     NA       NA
#> 7         Age group: 48-59 mo       0          0     NA       NA
#> 8                 Sex: Female       2          2     50 40.82483
#> 9                   Sex: Male       2          2      0  0.00000
#> 10 Age + sex: 00-05 mo.Female       0          0     NA       NA
#> 11 Age + sex: 06-11 mo.Female       0          0     NA       NA
#> 12 Age + sex: 12-23 mo.Female       0          0     NA       NA
#> 13 Age + sex: 24-35 mo.Female       2          2     50 40.82483
#> 14 Age + sex: 36-47 mo.Female       0          0     NA       NA
#> 15 Age + sex: 48-59 mo.Female       0          0     NA       NA
#> 16   Age + sex: 00-05 mo.Male       0          0     NA       NA
#> 17   Age + sex: 06-11 mo.Male       0          0     NA       NA
#> 18   Age + sex: 12-23 mo.Male       0          0     NA       NA
#> 19   Age + sex: 24-35 mo.Male       2          2      0  0.00000
#> 20   Age + sex: 36-47 mo.Male       0          0     NA       NA
#> 21   Age + sex: 48-59 mo.Male       0          0     NA       NA
```

Using the function `with` it is easy to apply `anthro_prevalence` to a
full dataset.

To look at all parameters, type `?anthro_prevalence`.

### Contribution

Contributions in the form of issues are very welcome. In particular if
you find any bugs.

### Using the package in your own analyses

The package has been tested thoroughly, but we cannot guarantee that
there aren’t any bugs nor comes this with any warranty. If you find a
bug or cannot reproduce results obtained with other implementations,
please post an issue.

anthro

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